balatt
b583f21e27
Userland: cat no longer tries to open "cat"
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I made the mistake of starting the initial for loop at i=0 when it
should have started at 1. argv[0] is the program name, argv[1] is an
argument.
2019-10-31 06:57:41 +01:00
balatt
5442e365c9
cat: Updated to handle multiple input files ( #694 )
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Now concatenates multiple files at once with a for loop iterating
through a vector of file arguments.
2019-10-29 16:08:09 +01:00
Andreas Kling
b07bbf383d
Userland: Run clang-format on everything.
2019-06-07 11:49:31 +02:00
Andreas Kling
6fa727a88e
cat: Fix some oversights in error handling.
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Error messages should go to stderr so they don't get mixed in with the
program's output. Also added a check for the return value of write().
2019-06-06 11:00:48 +02:00
Andreas Kling
df8e76a67c
cat: Just use fd 0 when no arguments are passed.
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I'm not sure why it seemed necessary at some point to open /dev/stdin rather
than simply using the already-open fd 0.
2019-04-25 16:01:28 +02:00
Andreas Kling
31f44481f3
Add /dev/{stdin,stdout,stderr} as symlinks to /proc/self/fd/{0,1,2}
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Also change /bin/cat to open /dev/stdin if no arguments are provided.
2019-02-03 12:38:03 +01:00
Andreas Kling
303577df16
Various stubs while trying to get an old coreutils to build.
2018-11-17 15:56:09 +01:00
Andreas Kling
da3857b0c2
Add some simple write buffering to LibC's stdio.
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Plumb it all the way to the VirtualConsole. Also fix /bin/cat to write()
the whole chunks we get from read() directly to stdout.
2018-11-08 01:23:47 +01:00
Andreas Kling
153ea704af
Add some basic signal support.
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It only works for sending a signal to a process that's in userspace code.
We implement reception by synthesizing a PUSHA+PUSHF in the receiving process
(operating on values in the TSS.)
The TSS CS:EIP is then rerouted to the signal handler and a tiny return
trampoline is constructed in a dedicated region in the receiving process.
Also hacked up /bin/kill to be able to send arbitrary signals (kill -N PID)
2018-11-06 10:56:41 +01:00
Andreas Kling
20fb1fc377
Fix some bugs in execve() and make sh use it for process launching.
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Interrupting children of sh now always works with ^C :^)
2018-11-03 02:08:06 +01:00
Andreas Kling
10b666f69a
Basic ^C interrupt implementation.
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For testing, I made cat put itself into a new process group.
This should eventually be done by sh between fork() and exec().
2018-11-02 14:06:48 +01:00
Andreas Kling
97726862dd
Add basic symlink support.
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- sys$readlink + readlink()
- Add a /proc/PID/exe symlink to the process's executable.
- Print symlink contents in ls output.
- Some work on plumbing options into VFS::open().
2018-10-28 14:11:51 +01:00
Andreas Kling
2716a9e2d7
Greatly improve /proc/PID/stack by tracing the ebp frame chain.
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I also added a generator cache to FileHandle. This way, multiple
reads to a generated file (i.e in a synthfs) can transparently
handle multiple calls to read() without the contents changing
between calls.
The cache is discarded at EOF (or when the FileHandle is destroyed.)
2018-10-27 00:14:24 +02:00
Andreas Kling
c928b06218
Add a very hackish /proc/PID/stack.
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It walks the stack and identifies anything that looks like a kernel symbol.
This could be a lot more sophisticated.
2018-10-26 22:33:15 +02:00
Andreas Kling
df87dda63c
Implement argc/argv support for spawned tasks.
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Celebrate the new functionality with a simple /bin/cat implementation. :^)
2018-10-26 11:16:56 +02:00
